Low peak-to-average power ratio demodulation reference signal sequence and pattern

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine one or more demodulation reference signal (DMRS) scrambling sequences using a low peak-to-average power ratio (PAPR) sequence generator, each corresponding to a respective port of one or more ports, the one or more ports being associated with a downlink multiple input multiple output (MIMO) communication, wherein the downlink MIMO communication is a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)-based communication. The UE may receive the downlink MIMO communication including a DMRS according to an intra-slot DMRS pattern that indicates one or more time domain multiplexed symbols, each being at least partially allocated with at least one DMRS scrambling sequence of the one or more DMRS scrambling sequences. Numerous other aspects are described.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for a lowpeak-to-average power ratio (PAPR) demodulation reference signal (DMRS)sequence and pattern.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency division multipleaccess (FDMA) systems, orthogonal frequency division multiple access(OFDMA) systems, single-carrier frequency division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LIE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless network may include one or more network nodes that supportcommunication for wireless communication devices, such as a userequipment (UE) or multiple UEs. A UE may communicate with a network nodevia downlink communications and uplink communications. “Downlink” (or“DL”) refers to a communication link from the network node to the UE,and “uplink” (or “UL”) refers to a communication link from the UE to thenetwork node. Some wireless networks may support device-to-devicecommunication, such as via a local link (e.g., a sidelink (SL), awireless local area network (WLAN) link, and/or a wireless personal areanetwork (WPAN) link, among other examples).

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent UEs to communicate on a municipal, national, regional, and/orglobal level. New Radio (NR), which may be referred to as 5G, is a setof enhancements to the LTE mobile standard promulgated by the 3GPP. NRis designed to better support mobile broadband internet access byimproving spectral efficiency, lowering costs, improving services,making use of new spectrum, and better integrating with other openstandards using orthogonal frequency division multiplexing (OFDM) with acyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and/orsingle-carrier frequency division multiplexing (SC-FDM) (also known asdiscrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, aswell as supporting beamforming, multiple-input multiple-output (MIMO)antenna technology, and carrier aggregation. As the demand for mobilebroadband access continues to increase, further improvements in LTE, NR,and other radio access technologies remain useful.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a diagram illustrating an example of a wireless network, inaccordance with the present disclosure.

FIG. 2 is a diagram illustrating an example of a network node incommunication with a user equipment (UE) in a wireless network, inaccordance with the present disclosure.

FIG. 3 is a diagram illustrating an example disaggregated base stationarchitecture, in accordance with the present disclosure.

FIGS. 4A and 4B are diagrams of an example associated with a lowpeak-to-average power ratio (PAPR) demodulation reference signal (DMRS)sequence and pattern, in accordance with the present disclosure.

FIG. 5 is a diagram illustrating an example process performed, forexample, by a UE, in accordance with the present disclosure.

FIG. 6 is a diagram illustrating an example process performed, forexample, by a network node, in accordance with the present disclosure.

FIG. 7 is a diagram of an example apparatus for wireless communication,in accordance with the present disclosure.

FIG. 8 is a diagram of an example apparatus for wireless communication,in accordance with the present disclosure.

SUMMARY

Some aspects described herein relate to a method of wirelesscommunication performed by a user equipment (UE). The method may includedetermining one or more demodulation reference signal (DMRS) scramblingsequences using a low peak-to-average power ratio (PAPR) sequencegenerator, where each DMRS scrambling sequence of the one or more DMRSscrambling sequences corresponds to a respective port of one or moreports, the one or more ports being associated with a downlink multipleinput multiple output (MIMO) communication, where the downlink MIMOcommunication is a discrete Fourier transform spread orthogonalfrequency division multiplexing (DFT-s-OFDM)-based communication. Themethod may include receiving the downlink MIMO communication including aDMRS according to an intra-slot DMRS pattern, where the intra-slot DMRSpattern indicates one or more time domain multiplexed symbols, eachsymbol of the one or more time domain multiplexed symbols being at leastpartially allocated with at least one DMRS scrambling sequence of theone or more DMRS scrambling sequences.

Some aspects described herein relate to a method of wirelesscommunication performed by a network node. The method may includedetermining one or more DMRS scrambling sequences using a low PAPRsequence generator, where each DMRS scrambling sequence of the one ormore DMRS scrambling sequences corresponds to a respective port of oneor more ports, the one or more ports being associated with a downlinkMIMO communication, where the downlink MIMO communication is aDFT-s-OFDM-based communication. The method may include transmitting thedownlink MIMO communication including a DMRS according to an intra-slotDMRS pattern, where the intra-slot DMRS pattern indicates one or moretime domain multiplexed symbols, each symbol of the one or more timedomain multiplexed symbols being at least partially allocated with atleast one DMRS scrambling sequence of the one or more DMRS scramblingsequences.

Some aspects described herein relate to a UE for wireless communication.The UE may include a memory and one or more processors coupled to thememory. The one or more processors may be configured to determine one ormore DMRS scrambling sequences using a low PAPR sequence generator,where each DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication, wherethe downlink MIMO communication is a DFT-s-OFDM-based communication. Theone or more processors may be configured to receive the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS pattern,where the intra-slot DMRS pattern indicates one or more time domainmultiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.

Some aspects described herein relate to a network node for wirelesscommunication. The network node may include a memory and one or moreprocessors coupled to the memory. The one or more processors may beconfigured to determine one or more DMRS scrambling sequences using alow PAPR sequence generator, where each DMRS scrambling sequence of theone or more DMRS scrambling sequences corresponds to a respective portof one or more ports, the one or more ports being associated with adownlink MIMO communication, where the downlink MIMO communication is aDFT-s-OFDM-based communication. The one or more processors may beconfigured to transmit the downlink MIMO communication including a DMRSaccording to an intra-slot DMRS pattern, where the intra-slot DMRSpattern indicates one or more time domain multiplexed symbols, eachsymbol of the one or more time domain multiplexed symbols being at leastpartially allocated with at least one DMRS scrambling sequence of theone or more DMRS scrambling sequences.

Some aspects described herein relate to a non-transitorycomputer-readable medium that stores a set of instructions for wirelesscommunication by a UE. The set of instructions, when executed by one ormore processors of the UE, may cause the UE to determine one or moreDMRS scrambling sequences using a low PAPR sequence generator, whereeach DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication, wherethe downlink MIMO communication is a DFT-s-OFDM-based communication. Theset of instructions, when executed by one or more processors of the UE,may cause the UE to receive the downlink MIMO communication including aDMRS according to an intra-slot DMRS pattern, where the intra-slot DMRSpattern indicates one or more time domain multiplexed symbols, eachsymbol of the one or more time domain multiplexed symbols being at leastpartially allocated with at least one DMRS scrambling sequence of theone or more DMRS scrambling sequences.

Some aspects described herein relate to a non-transitorycomputer-readable medium that stores a set of instructions for wirelesscommunication by a network node. The set of instructions, when executedby one or more processors of the network node, may cause the networknode to determine one or more DMRS scrambling sequences using a low PAPRsequence generator, where each DMRS scrambling sequence of the one ormore DMRS scrambling sequences corresponds to a respective port of oneor more ports, the one or more ports being associated with a downlinkMIMO communication, where the downlink MIMO communication is aDFT-s-OFDM-based communication. The set of instructions, when executedby one or more processors of the network node, may cause the networknode to transmit the downlink MIMO communication including a DMRSaccording to an intra-slot DMRS pattern, where the intra-slot DMRSpattern indicates one or more time domain multiplexed symbols, eachsymbol of the one or more time domain multiplexed symbols being at leastpartially allocated with at least one DMRS scrambling sequence of theone or more DMRS scrambling sequences.

Some aspects described herein relate to an apparatus for wirelesscommunication. The apparatus may include means for determining one ormore DMRS scrambling sequences using a low PAPR sequence generator,where each DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication, wherethe downlink MIMO communication is a DFT-s-OFDM-based communication. Theapparatus may include means for receiving the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS pattern,where the intra-slot DMRS pattern indicates one or more time domainmultiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.

Some aspects described herein relate to an apparatus for wirelesscommunication. The apparatus may include means for determining one ormore DMRS scrambling sequences using a low PAPR sequence generator,where each DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication, wherethe downlink MIMO communication is a DFT-s-OFDM-based communication. Theapparatus may include means for transmitting the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS pattern,where the intra-slot DMRS pattern indicates one or more time domainmultiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, network entity, network node, wireless communication device,and/or processing system as substantially described herein withreference to and as illustrated by the drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages, will be betterunderstood from the following description when considered in connectionwith the accompanying figures. Each of the figures is provided for thepurposes of illustration and description, and not as a definition of thelimits of the claims.

While aspects are described in the present disclosure by illustration tosome examples, those skilled in the art will understand that suchaspects may be implemented in many different arrangements and scenarios.Techniques described herein may be implemented using different platformtypes, devices, systems, shapes, sizes, and/or packaging arrangements.For example, some aspects may be implemented via integrated chipembodiments or other non-module-component based devices (e.g., end-userdevices, vehicles, communication devices, computing devices, industrialequipment, retail/purchasing devices, medical devices, and/or artificialintelligence devices). Aspects may be implemented in chip-levelcomponents, modular components, non-modular components, non-chip-levelcomponents, device-level components, and/or system-level components.Devices incorporating described aspects and features may includeadditional components and features for implementation and practice ofclaimed and described aspects. For example, transmission and receptionof wireless signals may include one or more components for analog anddigital purposes (e.g., hardware components including antennas, radiofrequency (RF) chains, power amplifiers, modulators, buffers,processors, interleavers, adders, and/or summers). It is intended thataspects described herein may be practiced in a wide variety of devices,components, systems, distributed arrangements, and/or end-user devicesof varying size, shape, and constitution.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. One skilled in theart should appreciate that the scope of the disclosure is intended tocover any aspect of the disclosure disclosed herein, whether implementedindependently of or combined with any other aspect of the disclosure.For example, an apparatus may be implemented or a method may bepracticed using any number of the aspects set forth herein. In addition,the scope of the disclosure is intended to cover such an apparatus ormethod which is practiced using other structure, functionality, orstructure and functionality in addition to or other than the variousaspects of the disclosure set forth herein. It should be understood thatany aspect of the disclosure disclosed herein may be embodied by one ormore elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

While aspects may be described herein using terminology commonlyassociated with a 5G or New Radio (NR) radio access technology (RAT),aspects of the present disclosure can be applied to other RATs, such asa 3G RAT, a 4G RAT, and/or a RAT subsequent to 5G (e.g., 6G).

FIG. 1 is a diagram illustrating an example of a wireless network 100,in accordance with the present disclosure. The wireless network 100 maybe or may include elements of a 5G (e.g., NR) network and/or a 4G (e.g.,Long Term Evolution (LTE)) network, among other examples. The wirelessnetwork 100 may include one or more network nodes 110 (shown as anetwork node 110 a, a network node 110 b, a network node 110 c, and anetwork node 110 d), a user equipment (UE) 120 or multiple UEs 120(shown as a UE 120 a, a UE 120 b, a UE 120 c, a UE 120 d, and a UE 120e), and/or other entities. A network node 110 is a network node thatcommunicates with UEs 120. As shown, a network node 110 may include oneor more network nodes. For example, a network node 110 may be anaggregated network node, meaning that the aggregated network node isconfigured to utilize a radio protocol stack that is physically orlogically integrated within a single radio access network (RAN) node(e.g., within a single device or unit). As another example, a networknode 110 may be a disaggregated network node (sometimes referred to as adisaggregated base station), meaning that the network node 110 isconfigured to utilize a protocol stack that is physically or logicallydistributed among two or more nodes (such as one or more central units(CUs), one or more distributed units (DUs), or one or more radio units(RUs)).

In some examples, a network node 110 is or includes a network node thatcommunicates with UEs 120 via a radio access link, such as an RU. Insome examples, a network node 110 is or includes a network node thatcommunicates with other network nodes 110 via a fronthaul link or amidhaul link, such as a DU. In some examples, a network node 110 is orincludes a network node that communicates with other network nodes 110via a midhaul link or a core network via a backhaul link, such as a CU.In some examples, a network node 110 (such as an aggregated network node110 or a disaggregated network node 110) may include multiple networknodes, such as one or more RUs, one or more CUs, and/or one or more DUs.A network node 110 may include, for example, an NR base station, an LTEbase station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), anaccess point, a transmission reception point (TRP), a DU, an RU, a CU, amobility element of a network, a core network node, a network element, anetwork equipment, a RAN node, or a combination thereof. In someexamples, the network nodes 110 may be interconnected to one another orto one or more other network nodes 110 in the wireless network 100through various types of fronthaul, midhaul, and/or backhaul interfaces,such as a direct physical connection, an air interface, or a virtualnetwork, using any suitable transport network.

In some examples, a network node 110 may provide communication coveragefor a particular geographic area. In the Third Generation PartnershipProject (3GPP), the term “cell” can refer to a coverage area of anetwork node 110 and/or a network node subsystem serving this coveragearea, depending on the context in which the term is used. A network node110 may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs 120 with service subscriptions.A pico cell may cover a relatively small geographic area and may allowunrestricted access by UEs 120 with service subscriptions. A femto cellmay cover a relatively small geographic area (e.g., a home) and mayallow restricted access by UEs 120 having association with the femtocell (e.g., UEs 120 in a closed subscriber group (CSG)). A network node110 for a macro cell may be referred to as a macro network node. Anetwork node 110 for a pico cell may be referred to as a pico networknode. A network node 110 for a femto cell may be referred to as a femtonetwork node or an in-home network node. In the example shown in FIG. 1, the network node 110 a may be a macro network node for a macro cell102 a, the network node 110 b may be a pico network node for a pico cell102 b, and the network node 110 c may be a femto network node for afemto cell 102 c. A network node may support one or multiple (e.g.,three) cells. In some examples, a cell may not necessarily bestationary, and the geographic area of the cell may move according tothe location of a network node 110 that is mobile (e.g., a mobilenetwork node).

In some aspects, the term “base station” or “network node” may refer toan aggregated base station, a disaggregated base station, an integratedaccess and backhaul (IAB) node, a relay node, or one or more componentsthereof. For example, in some aspects, “base station” or “network node”may refer to a CU, a DU, an RU, a Near-Real Time (Near-RT) RANIntelligent Controller (RIC), or a Non-Real Time (Non-RT) RIC, or acombination thereof. In some aspects, the term “base station” or“network node” may refer to one device configured to perform one or morefunctions, such as those described herein in connection with the networknode 110. In some aspects, the term “base station” or “network node” mayrefer to a plurality of devices configured to perform the one or morefunctions. For example, in some distributed systems, each of a quantityof different devices (which may be located in the same geographiclocation or in different geographic locations) may be configured toperform at least a portion of a function, or to duplicate performance ofat least a portion of the function, and the term “base station” or“network node” may refer to any one or more of those different devices.In some aspects, the term “base station” or “network node” may refer toone or more virtual base stations or one or more virtual base stationfunctions. For example, in some aspects, two or more base stationfunctions may be instantiated on a single device. In some aspects, theterm “base station” or “network node” may refer to one of the basestation functions and not another. In this way, a single device mayinclude more than one base station.

The wireless network 100 may include one or more relay stations. A relaystation is a network node that can receive a transmission of data froman upstream node (e.g., a network node 110 or a UE 120) and send atransmission of the data to a downstream node (e.g., a UE 120 or anetwork node 110). A relay station may be a UE 120 that can relaytransmissions for other UEs 120. In the example shown in FIG. 1 , thenetwork node 110 d (e.g., a relay network node) may communicate with thenetwork node 110 a (e.g., a macro network node) and the UE 120 d inorder to facilitate communication between the network node 110 a and theUE 120 d. A network node 110 that relays communications may be referredto as a relay station, a relay base station, a relay network node, arelay node, a relay, or the like.

The wireless network 100 may be a heterogeneous network that includesnetwork nodes 110 of different types, such as macro network nodes, piconetwork nodes, femto network nodes, relay network nodes, or the like.These different types of network nodes 110 may have different transmitpower levels, different coverage areas, and/or different impacts oninterference in the wireless network 100. For example, macro networknodes may have a high transmit power level (e.g., 5 to 40 watts) whereaspico network nodes, femto network nodes, and relay network nodes mayhave lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to or communicate with a set ofnetwork nodes 110 and may provide coordination and control for thesenetwork nodes 110. The network controller 130 may communicate with thenetwork nodes 110 via a backhaul communication link or a midhaulcommunication link. The network nodes 110 may communicate with oneanother directly or indirectly via a wireless or wireline backhaulcommunication link. In some aspects, the network controller 130 may be aCU or a core network device, or may include a CU or a core networkdevice.

The UEs 120 may be dispersed throughout the wireless network 100, andeach UE 120 may be stationary or mobile. A UE 120 may include, forexample, an access terminal, a terminal, a mobile station, and/or asubscriber unit. A UE 120 may be a cellular phone (e.g., a smart phone),a personal digital assistant (PDA), a wireless modem, a wirelesscommunication device, a handheld device, a laptop computer, a cordlessphone, a wireless local loop (WLL) station, a tablet, a camera, a gamingdevice, a netbook, a smartbook, an ultrabook, a medical device, abiometric device, a wearable device (e.g., a smart watch, smartclothing, smart glasses, a smart wristband, smart jewelry (e.g., a smartring or a smart bracelet)), an entertainment device (e.g., a musicdevice, a video device, and/or a satellite radio), a vehicular componentor sensor, a smart meter/sensor, industrial manufacturing equipment, aglobal positioning system device, a UE function of a network node,and/or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs 120 may be considered machine-type communication (MTC) orevolved or enhanced machine-type communication (eMTC) UEs. An MTC UEand/or an eMTC UE may include, for example, a robot, a drone, a remotedevice, a sensor, a meter, a monitor, and/or a location tag, that maycommunicate with a network node, another device (e.g., a remote device),or some other entity. Some UEs 120 may be considered Internet-of-Things(IoT) devices, and/or may be implemented as NB-IoT (narrowband IoT)devices. Some UEs 120 may be considered a Customer Premises Equipment. AUE 120 may be included inside a housing that houses components of the UE120, such as processor components and/or memory components. In someexamples, the processor components and the memory components may becoupled together. For example, the processor components (e.g., one ormore processors) and the memory components (e.g., a memory) may beoperatively coupled, communicatively coupled, electronically coupled,and/or electrically coupled.

In general, any number of wireless networks 100 may be deployed in agiven geographic area. Each wireless network 100 may support aparticular RAT and may operate on one or more frequencies. A RAT may bereferred to as a radio technology, an air interface, or the like. Afrequency may be referred to as a carrier, a frequency channel, or thelike. Each frequency may support a single RAT in a given geographic areain order to avoid interference between wireless networks of differentRATs. In some cases, NR or 5G RAT networks may be deployed.

In some examples, two or more UEs 120 (e.g., shown as UE 120 a and UE120 e) may communicate directly using one or more sidelink channels(e.g., without using a network node 110 as an intermediary tocommunicate with one another). For example, the UEs 120 may communicateusing peer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, or a vehicle-to-pedestrian (V2P) protocol), and/or amesh network. In such examples, a UE 120 may perform schedulingoperations, resource selection operations, and/or other operationsdescribed elsewhere herein as being performed by the network node 110.

Devices of the wireless network 100 may communicate using theelectromagnetic spectrum, which may be subdivided by frequency orwavelength into various classes, bands, channels, or the like. Forexample, devices of the wireless network 100 may communicate using oneor more operating bands. In 5G NR, two initial operating bands have beenidentified as frequency range designations FR1 (410 MHz-7.125 GHz) andFR2 (24.25 GHz-52.6 GHz). It should be understood that although aportion of FR1 is greater than 6 GHz, FR1 is often referred to(interchangeably) as a “Sub-6 GHz” band in various documents andarticles. A similar nomenclature issue sometimes occurs with regard toFR2, which is often referred to (interchangeably) as a “millimeter wave”band in documents and articles, despite being different from theextremely high frequency (EHF) band (30 GHz-300 GHz) which is identifiedby the International Telecommunications Union (ITU) as a “millimeterwave” band.

The frequencies between FR1 and FR2 are often referred to as mid-bandfrequencies. Recent 5G NR studies have identified an operating band forthese mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25 GHz). Frequency bands falling within FR3 may inherit FR1characteristics and/or FR2 characteristics, and thus may effectivelyextend features of FR1 and/or FR2 into mid-band frequencies. Inaddition, higher frequency bands are currently being explored to extend5G NR operation beyond 52.6 GHz. For example, three higher operatingbands have been identified as frequency range designations FR4a or FR4-1(52.6 GHz-71 GHz), FR4 (52.6 GHz-114.25 GHz), and FR5 (114.25 GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

With the above examples in mind, unless specifically stated otherwise,it should be understood that the term “sub-6 GHz” or the like, if usedherein, may broadly represent frequencies that may be less than 6 GHz,may be within FR1, or may include mid-band frequencies. Further, unlessspecifically stated otherwise, it should be understood that the term“millimeter wave” or the like, if used herein, may broadly representfrequencies that may include mid-band frequencies, may be within FR2,FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band. It iscontemplated that the frequencies included in these operating bands(e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and/or FR5) may be modified,and techniques described herein are applicable to those modifiedfrequency ranges.

In some aspects, the UE 120 may include a communication manager 140. Asdescribed in more detail elsewhere herein, the communication manager 140may determine one or more demodulation reference signal (DMRS)scrambling sequences using a low peak-to-average power ratio (PAPR)sequence generator, wherein each DMRS scrambling sequence of the one ormore DMRS scrambling sequences corresponds to a respective port of oneor more ports, the one or more ports being associated with a downlinkmultiple input multiple output (MIMO) communication, wherein thedownlink MIMO communication is a discrete Fourier transform spreadorthogonal frequency division multiplexing (DFT-s-OFDM)-basedcommunication; and receive the downlink MIMO communication including aDMRS according to an intra-slot DMRS pattern, wherein the intra-slotDMRS pattern indicates one or more time domain multiplexed symbols, eachsymbol of the one or more time domain multiplexed symbols being at leastpartially allocated with at least one DMRS scrambling sequence of theone or more DMRS scrambling sequences. Additionally, or alternatively,the communication manager 140 may perform one or more other operationsdescribed herein.

In some aspects, the network node may include a communication manager150. As described in more detail elsewhere herein, the communicationmanager 150 may determine one or more DMRS scrambling sequences using alow PAPR sequence generator, wherein each DMRS scrambling sequence ofthe one or more DMRS scrambling sequences corresponds to a respectiveport of one or more ports, the one or more ports being associated with adownlink MIMO communication, wherein the downlink MIMO communication isa DFT-s-OFDM-based communication; and transmit the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS pattern,wherein the intra-slot DMRS pattern indicates one or more time domainmultiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.Additionally, or alternatively, the communication manager 150 mayperform one or more other operations described herein.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1 .

FIG. 2 is a diagram illustrating an example 200 of a network node 110 incommunication with a UE 120 in a wireless network 100, in accordancewith the present disclosure. The network node 110 may be equipped with aset of antennas 234 a through 234 t, such as T antennas (T≥1). The UE120 may be equipped with a set of antennas 252 a through 252 r, such asR antennas (R≥1). The network node 110 of example 200 includes one ormore radio frequency components, such as antennas 234 and a modem 254.In some examples, a network node 110 may include an interface, acommunication component, or another component that facilitatescommunication with the UE 120 or another network node. Some networknodes 110 may not include radio frequency components that facilitatedirect communication with the UE 120, such as one or more CUs, or one ormore DUs.

At the network node 110, a transmit processor 220 may receive data, froma data source 212, intended for the UE 120 (or a set of UEs 120). Thetransmit processor 220 may select one or more modulation and codingschemes (MCSs) for the UE 120 based at least in part on one or morechannel quality indicators (CQIs) received from that UE 120. The networknode 110 may process (e.g., encode and modulate) the data for the UE 120based at least in part on the MCS(s) selected for the UE 120 and mayprovide data symbols for the UE 120. The transmit processor 220 mayprocess system information (e.g., for semi-static resource partitioninginformation (SRPI)) and control information (e.g., CQI requests, grants,and/or upper layer signaling) and provide overhead symbols and controlsymbols. The transmit processor 220 may generate reference symbols forreference signals (e.g., a cell-specific reference signal (CRS) or ademodulation reference signal (DMRS)) and synchronization signals (e.g.,a primary synchronization signal (PSS) or a secondary synchronizationsignal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO)processor 230 may perform spatial processing (e.g., precoding) on thedata symbols, the control symbols, the overhead symbols, and/or thereference symbols, if applicable, and may provide a set of output symbolstreams (e.g., T output symbol streams) to a corresponding set of modems232 (e.g., T modems), shown as modems 232 a through 232 t. For example,each output symbol stream may be provided to a modulator component(shown as MOD) of a modem 232. Each modem 232 may use a respectivemodulator component to process a respective output symbol stream (e.g.,for OFDM) to obtain an output sample stream. Each modem 232 may furtheruse a respective modulator component to process (e.g., convert toanalog, amplify, filter, and/or upconvert) the output sample stream toobtain a downlink signal. The modems 232 a through 232 t may transmit aset of downlink signals (e.g., T downlink signals) via a correspondingset of antennas 234 (e.g., T antennas), shown as antennas 234 a through234 t.

At the UE 120, a set of antennas 252 (shown as antennas 252 a through252 r) may receive the downlink signals from the network node 110 and/orother network nodes 110 and may provide a set of received signals (e.g.,R received signals) to a set of modems 254 (e.g., R modems), shown asmodems 254 a through 254 r. For example, each received signal may beprovided to a demodulator component (shown as DEMOD) of a modem 254.Each modem 254 may use a respective demodulator component to condition(e.g., filter, amplify, downconvert, and/or digitize) a received signalto obtain input samples. Each modem 254 may use a demodulator componentto further process the input samples (e.g., for OFDM) to obtain receivedsymbols. A MIMO detector 256 may obtain received symbols from the modems254, may perform MIMO detection on the received symbols if applicable,and may provide detected symbols. A receive processor 258 may process(e.g., demodulate and decode) the detected symbols, may provide decodeddata for the UE 120 to a data sink 260, and may provide decoded controlinformation and system information to a controller/processor 280. Theterm “controller/processor” may refer to one or more controllers, one ormore processors, or a combination thereof. A channel processor maydetermine a reference signal received power (RSRP) parameter, a receivedsignal strength indicator (RSSI) parameter, a reference signal receivedquality (RSRQ) parameter, and/or a CQI parameter, among other examples.In some examples, one or more components of the UE 120 may be includedin a housing 284.

The network controller 130 may include a communication unit 294, acontroller/processor 290, and a memory 292. The network controller 130may include, for example, one or more devices in a core network. Thenetwork controller 130 may communicate with the network node 110 via thecommunication unit 294.

One or more antennas (e.g., antennas 234 a through 234 t and/or antennas252 a through 252 r) may include, or may be included within, one or moreantenna panels, one or more antenna groups, one or more sets of antennaelements, and/or one or more antenna arrays, among other examples. Anantenna panel, an antenna group, a set of antenna elements, and/or anantenna array may include one or more antenna elements (within a singlehousing or multiple housings), a set of coplanar antenna elements, a setof non-coplanar antenna elements, and/or one or more antenna elementscoupled to one or more transmission and/or reception components, such asone or more components of FIG. 2 .

On the uplink, at the UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports that include RSRP, RSSI, RSRQ, and/or CQI) from thecontroller/processor 280. The transmit processor 264 may generatereference symbols for one or more reference signals. The symbols fromthe transmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by the modems 254 (e.g., for DFT-s-OFDM orCP-OFDM), and transmitted to the network node 110. In some examples, themodem 254 of the UE 120 may include a modulator and a demodulator. Insome examples, the UE 120 includes a transceiver. The transceiver mayinclude any combination of the antenna(s) 252, the modem(s) 254, theMIMO detector 256, the receive processor 258, the transmit processor264, and/or the TX MIMO processor 266. The transceiver may be used by aprocessor (e.g., the controller/processor 280) and the memory 282 toperform aspects of any of the methods described herein (e.g., withreference to FIGS. 4A-8 ).

At the network node 110, the uplink signals from UE 120 and/or other UEsmay be received by the antennas 234, processed by the modem 232 (e.g., ademodulator component, shown as DEMOD, of the modem 232), detected by aMIMO detector 236 if applicable, and further processed by a receiveprocessor 238 to obtain decoded data and control information sent by theUE 120. The receive processor 238 may provide the decoded data to a datasink 239 and provide the decoded control information to thecontroller/processor 240. The network node 110 may include acommunication unit 244 and may communicate with the network controller130 via the communication unit 244. The network node 110 may include ascheduler 246 to schedule one or more UEs 120 for downlink and/or uplinkcommunications. In some examples, the modem 232 of the network node 110may include a modulator and a demodulator. In some examples, the networknode 110 includes a transceiver. The transceiver may include anycombination of the antenna(s) 234, the modem(s) 232, the MIMO detector236, the receive processor 238, the transmit processor 220, and/or theTX MIMO processor 230. The transceiver may be used by a processor (e.g.,the controller/processor 240) and the memory 242 to perform aspects ofany of the methods described herein (e.g., with reference to FIGS. 4A-8).

The controller/processor 240 of the network node 110, thecontroller/processor 280 of the UE 120, and/or any other component(s) ofFIG. 2 may perform one or more techniques associated with a low PAPRDMRS sequence and pattern, as described in more detail elsewhere herein.For example, the controller/processor 240 of the network node 110, thecontroller/processor 280 of the UE 120, and/or any other component(s) ofFIG. 2 may perform or direct operations of, for example, process 500 ofFIG. 5 , process 600 of FIG. 6 , and/or other processes as describedherein. The memory 242 and the memory 282 may store data and programcodes for the network node 110 and the UE 120, respectively. In someexamples, the memory 242 and/or the memory 282 may include anon-transitory computer-readable medium storing one or more instructions(e.g., code and/or program code) for wireless communication. Forexample, the one or more instructions, when executed (e.g., directly, orafter compiling, converting, and/or interpreting) by one or moreprocessors of the network node 110 and/or the UE 120, may cause the oneor more processors, the UE 120, and/or the network node 110 to performor direct operations of, for example, process 500 of FIG. 5 , process600 of FIG. 6 , and/or other processes as described herein. In someexamples, executing instructions may include running the instructions,converting the instructions, compiling the instructions, and/orinterpreting the instructions, among other examples.

In some aspects, a UE (e.g., the UE 120) includes means for determiningone or more DMRS scrambling sequences using a low PAPR sequencegenerator, wherein each DMRS scrambling sequence of the one or more DMRSscrambling sequences corresponds to a respective port of one or moreports, the one or more ports being associated with a downlink MIMOcommunication, wherein the downlink MIMO communication is aDFT-s-OFDM-based communication; and/or means for receiving the downlinkMIMO communication including a DMRS according to an intra-slot DMRSpattern, wherein the intra-slot DMRS pattern indicates one or more timedomain multiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.The means for the UE 120 to perform operations described herein mayinclude, for example, one or more of communication manager 140, antenna252, modem 254, MIMO detector 256, receive processor 258, transmitprocessor 264, TX MIMO processor 266, controller/processor 280, ormemory 282.

In some aspects, a network node (e.g., the network node 110) includesmeans for determining one or more DMRS scrambling sequences using a lowPAPR sequence generator, wherein each DMRS scrambling sequence of theone or more DMRS scrambling sequences corresponds to a respective portof one or more ports, the one or more ports being associated with adownlink MIMO communication, wherein the downlink MIMO communication isa DFT-s-OFDM-based communication; and/or means for transmitting thedownlink MIMO communication including a DMRS according to an intra-slotDMRS pattern, wherein the intra-slot DMRS pattern indicates one or moretime domain multiplexed symbols, each symbol of the one or more timedomain multiplexed symbols being at least partially allocated with atleast one DMRS scrambling sequence of the one or more DMRS scramblingsequences. In some aspects, the means for the network node to performoperations described herein may include, for example, one or more ofcommunication manager 150, transmit processor 220, TX MIMO processor230, modem 232, antenna 234, MIMO detector 236, receive processor 238,controller/processor 240, memory 242, or scheduler 246.

While blocks in FIG. 2 are illustrated as distinct components, thefunctions described above with respect to the blocks may be implementedin a single hardware, software, or combination component or in variouscombinations of components. For example, the functions described withrespect to the transmit processor 264, the receive processor 258, and/orthe TX MIMO processor 266 may be performed by or under the control ofthe controller/processor 280.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2 .

Deployment of communication systems, such as 5G NR systems, may bearranged in multiple manners with various components or constituentparts. In a 5G NR system, or network, a network node, a network entity,a mobility element of a network, a RAN node, a core network node, anetwork element, a base station, or a network equipment may beimplemented in an aggregated or disaggregated architecture. For example,a base station (such as a Node B (NB), an evolved NB (eNB), an NR BS, a5G NB, an access point (AP), a TRP, or a cell, among other examples), orone or more units (or one or more components) performing base stationfunctionality, may be implemented as an aggregated base station (alsoknown as a standalone base station or a monolithic base station) or adisaggregated base station. “Network entity” or “network node” may referto a disaggregated base station, or to one or more units of adisaggregated base station (such as one or more CUs, one or more DUs,one or more RUs, or a combination thereof).

An aggregated base station (e.g., an aggregated network node) may beconfigured to utilize a radio protocol stack that is physically orlogically integrated within a single RAN node (e.g., within a singledevice or unit). A disaggregated base station (e.g., a disaggregatednetwork node) may be configured to utilize a protocol stack that isphysically or logically distributed among two or more units (such as oneor more CUs, one or more DUs, or one or more RUs). In some examples, aCU may be implemented within a network node, and one or more DUs may beco-located with the CU, or alternatively, may be geographically orvirtually distributed throughout one or multiple other network nodes.The DUs may be implemented to communicate with one or more RUs. Each ofthe CU, DU, and RU also can be implemented as virtual units, such as avirtual central unit (VCU), a virtual distributed unit (VDU), or avirtual radio unit (VRU), among other examples.

Base station-type operation or network design may consider aggregationcharacteristics of base station functionality. For example,disaggregated base stations may be utilized in an IAB network, an openradio access network (O-RAN (such as the network configuration sponsoredby the O-RAN Alliance)), or a virtualized radio access network (vRAN,also known as a cloud radio access network (C-RAN)) to facilitatescaling of communication systems by separating base stationfunctionality into one or more units that can be individually deployed.A disaggregated base station may include functionality implementedacross two or more units at various physical locations, as well asfunctionality implemented for at least one unit virtually, which canenable flexibility in network design. The various units of thedisaggregated base station can be configured for wired or wirelesscommunication with at least one other unit of the disaggregated basestation.

FIG. 3 is a diagram illustrating an example disaggregated base stationarchitecture 300, in accordance with the present disclosure. Thedisaggregated base station architecture 300 may include a CU 310 thatcan communicate directly with a core network 320 via a backhaul link, orindirectly with the core network 320 through one or more disaggregatedcontrol units (such as a Near-RT RIC 325 via an E2 link, or a Non-RT RIC315 associated with a Service Management and Orchestration (SMO)Framework 305, or both). A CU 310 may communicate with one or more DUs330 via respective midhaul links, such as through F1 interfaces. Each ofthe DUs 330 may communicate with one or more RUs 340 via respectivefronthaul links Each of the RUs 340 may communicate with one or more UEs120 via respective radio frequency (RF) access links. In someimplementations, a UE 120 may be simultaneously served by multiple RUs340.

Each of the units, including the CUs 310, the DUs 330, the RUs 340, aswell as the Near-RT RICs 325, the Non-RT RICs 315, and the SMO Framework305, may include one or more interfaces or be coupled with one or moreinterfaces configured to receive or transmit signals, data, orinformation (collectively, signals) via a wired or wireless transmissionmedium. Each of the units, or an associated processor or controllerproviding instructions to one or multiple communication interfaces ofthe respective unit, can be configured to communicate with one or moreof the other units via the transmission medium. In some examples, eachof the units can include a wired interface, configured to receive ortransmit signals over a wired transmission medium to one or more of theother units, and a wireless interface, which may include a receiver, atransmitter or transceiver (such as an RF transceiver), configured toreceive or transmit signals, or both, over a wireless transmissionmedium to one or more of the other units.

In some aspects, the CU 310 may host one or more higher layer controlfunctions. Such control functions can include radio resource control(RRC) functions, packet data convergence protocol (PDCP) functions, orservice data adaptation protocol (SDAP) functions, among other examples.Each control function can be implemented with an interface configured tocommunicate signals with other control functions hosted by the CU 310.The CU 310 may be configured to handle user plane functionality (forexample, Central Unit-User Plane (CU-UP) functionality), control planefunctionality (for example, Central Unit-Control Plane (CU-CP)functionality), or a combination thereof. In some implementations, theCU 310 can be logically split into one or more CU-UP units and one ormore CU-CP units. A CU-UP unit can communicate bidirectionally with aCU-CP unit via an interface, such as the E1 interface when implementedin an O-RAN configuration. The CU 310 can be implemented to communicatewith a DU 330, as necessary, for network control and signaling.

Each DU 330 may correspond to a logical unit that includes one or morebase station functions to control the operation of one or more RUs 340.In some aspects, the DU 330 may host one or more of a radio link control(RLC) layer, a MAC layer, and one or more high physical (PHY) layersdepending, at least in part, on a functional split, such as a functionalsplit defined by the 3GPP. In some aspects, the one or more high PHYlayers may be implemented by one or more modules for forward errorcorrection (FEC) encoding and decoding, scrambling, and modulation anddemodulation, among other examples. In some aspects, the DU 330 mayfurther host one or more low PHY layers, such as implemented by one ormore modules for a fast Fourier transform (FFT), an inverse FFT (iFFT),digital beamforming, or physical random access channel (PRACH)extraction and filtering, among other examples. Each layer (which alsomay be referred to as a module) can be implemented with an interfaceconfigured to communicate signals with other layers (and modules) hostedby the DU 330, or with the control functions hosted by the CU 310.

Each RU 340 may implement lower-layer functionality. In somedeployments, an RU 340, controlled by a DU 330, may correspond to alogical node that hosts RF processing functions or low-PHY layerfunctions, such as performing an FFT, performing an iFFT, digitalbeamforming, or PRACH extraction and filtering, among other examples,based on a functional split (for example, a functional split defined bythe 3GPP), such as a lower layer functional split. In such anarchitecture, each RU 340 can be operated to handle over the air (OTA)communication with one or more UEs 120. In some implementations,real-time and non-real-time aspects of control and user planecommunication with the RU(s) 340 can be controlled by the correspondingDU 330. In some scenarios, this configuration can enable each DU 330 andthe CU 310 to be implemented in a cloud-based RAN architecture, such asa vRAN architecture.

The SMO Framework 305 may be configured to support RAN deployment andprovisioning of non-virtualized and virtualized network elements. Fornon-virtualized network elements, the SMO Framework 305 may beconfigured to support the deployment of dedicated physical resources forRAN coverage requirements, which may be managed via an operations andmaintenance interface (such as an O1 interface). For virtualized networkelements, the SMO Framework 305 may be configured to interact with acloud computing platform (such as an open cloud (O-Cloud) platform 390)to perform network element life cycle management (such as to instantiatevirtualized network elements) via a cloud computing platform interface(such as an O2 interface). Such virtualized network elements caninclude, but are not limited to, CUs 310, DUs 330, RUs 340, non-RT RICs315, and Near-RT RICs 325. In some implementations, the SMO Framework305 can communicate with a hardware aspect of a 4G RAN, such as an openeNB (O-eNB) 311, via an O1 interface. Additionally, in someimplementations, the SMO Framework 305 can communicate directly witheach of one or more RUs 340 via a respective O1 interface. The SMOFramework 305 also may include a Non-RT RIC 315 configured to supportfunctionality of the SMO Framework 305.

The Non-RT RIC 315 may be configured to include a logical function thatenables non-real-time control and optimization of RAN elements andresources, Artificial Intelligence/Machine Learning (AI/ML) workflowsincluding model training and updates, or policy-based guidance ofapplications/features in the Near-RT RIC 325. The Non-RT RIC 315 may becoupled to or communicate with (such as via an A1 interface) the Near-RTRIC 325. The Near-RT RIC 325 may be configured to include a logicalfunction that enables near-real-time control and optimization of RANelements and resources via data collection and actions over an interface(such as via an E2 interface) connecting one or more CUs 310, one ormore DUs 330, or both, as well as an O-eNB, with the Near-RT RIC 325.

In some implementations, to generate AI/ML models to be deployed in theNear-RT RIC 325, the Non-RT RIC 315 may receive parameters or externalenrichment information from external servers. Such information may beutilized by the Near-RT RIC 325 and may be received at the SMO Framework305 or the Non-RT RIC 315 from non-network data sources or from networkfunctions. In some examples, the Non-RT RIC 315 or the Near-RT RIC 325may be configured to tune RAN behavior or performance. For example, theNon-RT RIC 315 may monitor long-term trends and patterns for performanceand employ AI/ML, models to perform corrective actions through the SMOFramework 305 (such as reconfiguration via an O1 interface) or viacreation of RAN management policies (such as A1 interface policies).

As indicated above, FIG. 3 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 3 .

According to some wireless communication standards, an orthogonalfrequency division multiplexing (OFDM) waveform is the only configurablewaveform that can be used for a downlink data communication, such as aphysical downlink shared channel (PDSCH) communication. Notably, somewireless communication standards support the use of a discrete Fouriertransform spread OFDM (DFT-s-OFDM)-based waveform (also referred to astransform precoding), but only for uplink communications with a singlespatial layer.

Additionally, a demodulation reference signal (DMRS) scrambling sequenceto be used for a PDSCH communication may be based on a pseudo-randomquadrature phase shift keying (QPSK) sequence, with the scramblingsequence being determined based on an output of a Gold-sequencegenerator. Such a scrambling sequence is designed such that apeak-to-average power ratio (PAPR) of a DMRS does not exceed a PAPR ofdata carrying symbols in a downlink communication, with an assumptionthat an OFDM waveform is used for the downlink communication.

Notably, when operating in a sub-terahertz (sub-THz) band (e.g., afrequency band at or above approximately 52 gigahertz (GHz)), a singlecarrier waveform, such as DFT-s-OFDM, is advantageous over OFDM fordownlink multiple input multiple output (MIMO) communications. Onereason that a single carrier waveform is advantageous over OFDM fordownlink MIMO communications is that strong phase noise is expected inthe sub-THZ band (due to the relatively high carrier-frequency), and thesingle carrier waveform provides improved phase noise resiliency byallowing a time-domain phase tracking reference signal (PTRS) to be usedin order to provide phase noise mitigation. Another reason that a singlecarrier waveform is advantageous over OFDM for downlink MIMOcommunications in the sub-Thz band is that a high efficiency poweramplifier (PA) design is challenging, and a PA in the sub-THz bandsuffers from low efficiency and limited linear region. To mitigate this,single carrier waveforms that naturally show lower PAPR characteristicsare preferable.

In one illustrative example, the table below shows throughput (TP) gainsthat can be achieved using a DFT-s-OFDM waveform as compared to an OFDMwaveform for different signal-to-noise ratio (SNR) values:

SNR OFDM TP DFT-s-OFDM TP TP Gain [dB] [Gbps] [Gbps] [%] 15 47.7 57.622% 20 67.5 79.9 18% 25 89.3 104.1 17% 30 103.8 122.5 18% 35 112.4 138.825%

In this example, a simulation assuming a 4×4 downlink MIMO use case at acarrier frequency of 144 Ghz (and an assumption of a relevant phasenoise mask), with a bandwidth of 7.5 GHz and a subcarrier spacing (SCS)of 960 kilohertz (kHz) was used.

However, even when a DFT-s-OFDM waveform could be used for a downlinkMIMO communication, a DMRS symbol associated with the downlink MIMOcommunication would still be OFDM-based. This is required in order toachieve frequency domain equalization that is possible only with anOFDM-based DMRS.

When considering a low PAPR of a DFT-s-OFDM waveform (as compared to theOFDM waveform), a DMRS scrambling sequence that is determined based on aGolden-sequence generator is no longer adequate, as the DMRS symbol mayexhibit a higher PAPR than that of the data carrying symbols of thedownlink MIMO communication. The severity of this problem increases forwireless communications in the sub-Thz band, where large bandwidths(e.g., in the orders of Ghz) are used to support extreme data rates,which translates to higher PAPR. Given this consideration, DMRSscrambling sequence generation should be adjusted such that the PAPR ofthe DMRS is equal to or lower than the PAPR of the data carrying symbolsin the downlink MIMO communication.

Some techniques and apparatuses described herein enable a low PAPR DMRSsequence and pattern. In some aspects, a wireless communication device(e.g., a UE, a network node, or the like) may determine one or more DMRSscrambling sequences using a low PAPR sequence generator, where eachDMRS scrambling sequence corresponds to a respective port of one or moreports associated with a downlink MIMO communication (e.g., aDFT-s-OFDM-based communication). The wireless communication device maythen communicate (e.g., receive or transmit) the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS patternthat indicates one or more time domain multiplexed symbols, each beingat least partially allocated with at least one of the one or more DMRSscrambling sequences.

In some aspects, the techniques and apparatuses described herein enablea low PAPR DFT-s-OFDM waveform to be used for a downlink MIMOtransmission (e.g., in the sub-Thz band), thereby allowing the increasedthroughput, range extension, and power efficiency that is afforded byuse of the low PAPR DFT-s-OFDM waveform to be realized. For example, alow PAPR DMRS scrambling sequence, as described herein, may cause thePAPR in the one or more DMRS symbols to be approximately equal to orlower than PAPR in data carrying symbols of the downlink MIMOcommunication, thereby facilitating use of the low PAPR DFT-s-OFDMwaveform for the downlink MIMO transmission. Further, the intra-slotDMRS pattern described herein may be utilized to achieve low PAPR in theone or more DMRS symbols, further facilitating the use of the low PAPRDFT-s-OFDM waveform for the downlink MIMO transmission. Additionally,the techniques and apparatuses described herein may enable support for ahigh number of ports (e.g., more than 12 ports) to be used for downlinkMIMO communications. Additional details are provided below.

FIGS. 4A and 4B are diagrams of an example 400 associated with a lowPAPR DMRS sequence and pattern, in accordance with the presentdisclosure. As shown in FIG. 4A, example 400 includes communicationbetween a network node 110 and a UE 120. In some aspects, the networknode 110 and the UE 120 may be included in a wireless network, such as awireless network 100. The network node 110 and the UE 120 maycommunicate via a wireless access link, which may include an uplink anda downlink.

As shown by reference 402, the UE 120 may determine one or more DMRSscrambling sequences using a low PAPR sequence generator. In someaspects, each DMRS scrambling sequence of the one or more DMRSscrambling sequences may correspond to a respective port of one or moreports, where each port of the one or more ports is associated with adownlink MIMO communication. That is, a downlink MIMO communication maybe scheduled to be transmitted by the network node 110 and received bythe UE 120 via one or more ports. Here, each of the one or more DMRSscrambling sequences determined by the low PAPR sequence generator maycorrespond to a different port of the one or more ports. In someaspects, the downlink communication is a DFT-s-OFDM-based communication.

In some aspects, the low PAPR sequence generator is a Zadoff-Chu (ZC)sequence generator. That is, in some aspects, the UE 120 is configuredwith a low PAPR sequence generator configured to generate the one ormore DMRS scrambling sequences based on one or more ZC sequences.Notably, a quantity of ZC sequences that can be generated by the UE 120is not significantly limited in higher frequency bands (e.g., thesub-THz band) because a required sequence length is relatively large dueto a relatively large bandwidth being used for wireless communication inhigher frequency bands. Further, relatively high attenuation of wirelesscommunication in the sub-Thz band, along with directivity of transmitbeams used for wireless communication, reduces cross-cell inference.

Additionally, ZC sequences are constant amplitude zero autocorrelationwaveform (CAZAC) sequences, which hold the property of timedomain—frequency domain equivalence, meaning that the inverse DFT of agiven ZC sequence results in another scaled ZC sequence. Therefore, theuse of ZC sequences can enable extremely low PAPR to be achieved.However, this property does not hold when orthogonal cover codes (OCC)and frequency domain multiplexing (FDM) of multiple sequences (whichcorrespond to different ports) are used in a DMRS symbol to supportdownlink MIMO communication. In some aspects, this limitation can bemitigated by implementing an intra-slot DMRS pattern in which each DMRSsymbol is at least partially allocated with a sequence that correspondsto a single spatial layer (i.e., a single port) and different spatiallayers are time domain multiplexed (TDM). In some aspects, such anintra-slot DMRS pattern eliminates a need for OCC and FDM to supportmultiple ports. Additional details regarding the intra-slot DMRS patternare described below.

As shown by reference 404, the network node 110 may determine the one ormore DMRS scrambling sequences using a low PAPR sequence generator,where each DMRS scrambling sequence corresponds to the respective portof the one or more ports associated with the downlink MIMOcommunication. In some aspects, the network node 110 may determine theone or more DMRS scrambling sequences in a manner similar to that inwhich the UE 120 determines the one or more DMRS scrambling sequences,as described herein.

As shown by reference 406, the network node 110 may transmit, and the UE120 may receive, the downlink MIMO communication including a DMRSaccording to an intra-slot DMRS pattern. In some aspects, the downlinkMIMO communication is communicated (e.g., transmitted by the networknode 110 or received by the UE 120) on a frequency that is greater thanapproximately 52 GHz. For example, in some aspects, the downlink MIMOcommunication may be communicated in the sub-Thz band.

In some aspects, the intra-slot DMRS pattern indicates one or more timedomain multiplexed symbols, where each symbol of the one or more timedomain multiplexed symbols is at least partially allocated with at leastone DMRS scrambling sequence of the one or more DMRS scramblingsequences. Notably, such an intra-slot DMRS pattern eliminates a needfor OCC and FDM to support communication of the downlink MIMOcommunication using multiple ports. In some aspects, the intra-slot DMRSpattern enables support for communication via a high number of ports(e.g., more than 12 ports). For the sub-Thz case, such a high number ofports may be utilized for, for example, lensed MIMO where each portcorresponds to a different beam.

FIG. 4B is a diagram illustrating an example of an intra-slot DMRSpattern that indicates one or more time domain multiplexed symbols, eachbeing at least partially allocated with at least one DMRS scramblingsequence of the one or more DMRS scrambling sequences. In the exampleshown in FIG. 4B, the intra-slot DMRS pattern is utilized in a firstslot (e.g., Slot 1 as identified in FIG. 4B) in a group of slots (e.g.,Slots 1 through 3 are shown in FIG. 4B). Here, as shown, the intra-slotDMRS pattern indicates that a first time domain multiplexed symbol(e.g., symbol 0) of the first slot is at least partially allocated witha first DMRS scrambling sequence (e.g., DMRS scrambling sequence A),where the first DMRS scrambling sequence corresponds to a first port(e.g., Port 1) associated with the downlink MIMO communication. Theintra-slot DMRS pattern further indicates that a second time domainmultiplexed symbol (e.g., symbol 1) of the first slot is at leastpartially allocated with a second DMRS scrambling sequence (e.g., DMRSscrambling sequence B), where the second DMRS scrambling sequencecorresponds to a second port (e.g., Port 2) associated with the downlinkMIMO communication. The intra-slot DMRS pattern further indicates that athird time domain multiplexed symbol (e.g., symbol 2) of the first slotis at least partially allocated with a third DMRS scrambling sequence(e.g., DMRS scrambling sequence C), where the third DMRS scramblingsequence corresponds to a third port (e.g., Port 3) associated with thedownlink MIMO communication. The intra-slot DMRS pattern furtherindicates that a fourth time domain multiplexed symbol (e.g., symbol 3)of the first slot is at least partially allocated with a fourth DMRSscrambling sequence (e.g., DMRS scrambling sequence D), where the fourthDMRS scrambling sequence corresponds to a fourth port (e.g., Port 4)associated with the downlink MIMO communication. As shown, other symbolsof the first slot (and symbols of Slot 2 and Slot 3) may carry dataassociated with the downlink MIMO communication. An intra-slot DMRSpattern such as that illustrated in FIG. 4B may cause a PAPR of thesymbols carrying DMRS to remain low (e.g., less than or approximatelyequal to a PAPR of the data carrying symbols), meaning that PAPRs of theDMRS symbols are not a limiting factor for communicating the downlinkMIMO communication. Further, the low PAPR achieved in the symbolscarrying DMRS using an intra-slot DMRS pattern such as that illustratedin FIG. 4B provide channel estimation processing gains.

In some aspects, the intra-slot DMRS pattern may indicate that a givensymbol of the one or more time domain multiplexed symbols is partiallyallocated with a single DMRS scrambling sequence of the one or more DMRSscrambling sequences. For example, the given symbol may comprise Nfrequency resources (e.g., subcarriers, resource blocks, or the like),and the intra-slot DMRS pattern may indicate that M (M<N) frequencyresources of the N frequency resources are allocated with the singleDMRS scrambling sequence. In some aspects, partial allocation of a givensymbol with a single DMRS scrambling sequence may provideinter-carrier-interference (ICI) mitigation on the given symbol (e.g.,caused by the phase noise impairment) or may improve channel estimation.

Additionally, or alternatively, the intra-slot DMRS pattern may indicatethat a given symbol of the one or more time domain multiplexed symbolsis fully allocated with a single DMRS scrambling sequence of the one ormore DMRS scrambling sequences. For example, the given symbol maycomprise N frequency resources, and the intra-slot DMRS pattern mayindicate that each of the N frequency resources are allocated with thesingle DMRS scrambling sequence. In some aspects, full allocation of thegiven symbol with a single sequence can provide channel estimationprocessing gain (e.g., due to increased frequency domain resolution).Additionally, full allocation of the given symbol may increase apossible number of sequences that can be used, which facilitates use ofthe low PAPR sequence generator, as described above.

In some aspects, whether a given symbol is fully allocated or partiallyallocated may be based at least in part on a dominating impairmentassociated with the symbol. In some aspects, a determination of whethera given symbol is fully allocated or partially allocated may beindependent of such a determination for another symbol (e.g., eachsymbol may be allocated independently).

In some aspects, partial allocation of symbols carrying DMRS may beperformed with different comb factors (e.g., controlling the number ofzero power resource elements (REs) between allocated REs) depending onthe dominating impairment. In some aspects, the network node 110 may beconfigured (e.g., according to an applicable wireless communicationstandard) with a DMRS boosting factor to be applied for full allocationof DMRS symbols, given that each DMRS symbol contains only a singlelayer (while data carrying symbols of the slot contain all layers). Insome aspects, the DMRS boosting factor may be adjusted such that powerof the symbols carrying DMRS will be increased (e.g., maximized) underdifferent PAPR values.

In some aspects, the intra-slot DMRS pattern indicates that a symbol ofthe one or more time domain multiplexed symbols is at least partiallyallocated with a first DMRS scrambling sequence of the one or more DMRSscrambling sequences and is at least partially allocated with a secondDMRS scrambling sequence of the one or more DMRS scrambling sequences.For example, the intra-slot DMRS pattern may indicate that M₁ (M₁≥1)frequency resources (e.g., subcarriers, resource blocks, or the like) ofthe given symbol are allocated with a first DMRS scrambling sequence andthat M₂ (M₂≥1) frequency resources (e.g., subcarriers, resource blocks,or the like) of the given symbol are allocated with a second DMRSscrambling sequence, where the given symbol comprises N frequencyresources. In this example, a sum of M₁ and M₂ is less than or equal toN. In some aspects, multiple DMRS scrambling sequences (e.g., two DMRSscrambling sequences), each corresponding to a respective port, can bemultiplexed on a given DMRS symbol while still utilizing the intra-slotDMRS pattern described herein in order to, for example, reduce DMRSoverhead.

Notably, while the intra-slot DMRS pattern described herein can beutilized for a DFT-s-OFDM-based waveform, the intra-slot DMRS patterncan also be applied to a communication that uses an OFDM waveform (e.g.,with a ZC sequence or without a ZC sequence). In some aspects,application of the intra-slot DMRS pattern to an OFDM waveform can lowerPAPR in the symbols carrying the DMRS in order to increase channelestimation processing gains.

In some aspects, the network node 110 may transmit, and the UE 120 mayreceive, a configuration that indicates the intra-slot DMRS pattern. Insome aspects, the configuration is communicated (e.g., transmitted orreceived) via downlink control information (DCI), a medium accesscontrol (MAC) control element (CE), or radio resource control (RRC)signaling. In some aspects, the network node 110 may transmit theconfiguration based at least in part on a determination that acharacteristic of a channel associated with the downlink MIMOcommunication satisfies a threshold. For example, the network node 110may transmit the configuration for the intra-slot DMRS pattern to the UE120 based at least in part on a determination that an SNR of a channelassociated with the downlink MIMO communication satisfies a threshold.In this way, the network node 110 may (dynamically) adjust theintra-slot pattern (e.g., change a given symbol from a partialallocation to a full allocation, or vice versa) in order to increasethroughput, reliability, or the like, of wireless communications.

In some aspects, the network node 110 may transmit, and the UE 120 mayreceive, the DMRS according to an inter-slot DMRS pattern that indicatesone or more slots, of a plurality of slots of the downlink MIMOcommunication, in which the DMRS is to be received. For example, withreference to FIG. 4B, the inter-slot pattern indicates that the DMRS iscommunicated in only the first slot of a plurality of slots (e.g., Slot1, Slot 2, and Slot 3). In some aspects, the inter-slot DMRS patternindicates that the DMRS is carried in a relatively small quantity ofslots in a given plurality of slots (e.g., one out of every eightslots). Such an inter-slot DMRS pattern may be referred to as a sparseinter-slot DMRS pattern. In some aspects, a sparse inter-slot DMRSpattern may result in a reduced PDSCH pilot overhead and an increase indata rate (e.g., as compared to a less sparse inter-slot DMRS pattern).In some aspects, a sparse inter-slot DMRS pattern may be utilized incombination with the intra-slot DMRS pattern described herein to reduceoverhead (e.g., despite a quantity of symbols carrying DMRS according tothe intra-slot DMRS pattern being greater than a quantity of symbolstypically used to carry the DMRS).

In some aspects, a sparse inter-slot DMRS pattern may be suitable fordownlink MIMO communication in the sub-THz band since it is expectedthat UEs 120 using the sub-THz band would be relatively static (e.g.,low mobility) and that channels in the sub-THz band would be relativelyflat (e.g., due to a low delay spread and strong line-of-sightcomponent).

In some aspects, the network node 110 may transmit, and the UE 120 mayreceive, a configuration that indicates the inter-slot DMRS pattern. Insome aspects, the configuration is communicated (e.g., transmitted orreceived) via DCI, a MAC-CE, or RRC signaling. In some aspects, thenetwork node 110 may transmit the configuration based at least in parton a determination that a characteristic of a channel associated withthe downlink MIMO communication satisfies a threshold. For example, thenetwork node 110 may transmit the configuration for the inter-slot DMRSpattern to the UE 120 based at least in part on a determination that anSNR of a channel associated with the downlink MIMO communicationsatisfies (e.g., is above or below) a threshold. In this way, thenetwork node 110 may (dynamically) adjust the inter-slot pattern inorder to increase throughput, reliability, or the like, of wirelesscommunications.

As indicated above, FIGS. 4A and 4B are provided as examples. Otherexamples may differ from what is described with respect to FIGS. 4A and4B.

FIG. 5 is a diagram illustrating an example process 500 performed, forexample, by a UE, in accordance with the present disclosure. Exampleprocess 500 is an example where the UE (e.g., UE 120) performsoperations associated with a low PAPR DMRS sequence and pattern.

As shown in FIG. 5 , in some aspects, process 500 may includedetermining one or more DMRS scrambling sequences using a low PAPRsequence generator, wherein each DMRS scrambling sequence of the one ormore DMRS scrambling sequences corresponds to a respective port of oneor more ports, the one or more ports being associated with a downlinkMIMO communication, wherein the downlink MIMO communication is aDFT-s-OFDM-based communication (block 510). For example, the UE (e.g.,using communication manager 140 and/or low PAPR scrambling sequencegenerator 708, depicted in FIG. 7 ) may determine one or more DMRSscrambling sequences using a low PAPR sequence generator, wherein eachDMRS scrambling sequence of the one or more DMRS scrambling sequencescorresponds to a respective port of one or more ports, the one or moreports being associated with a downlink MIMO communication, wherein thedownlink MIMO communication is a DFT-s-OFDM-based communication, asdescribed above.

As further shown in FIG. 5 , in some aspects, process 500 may includereceiving the downlink MIMO communication including a DMRS according toan intra-slot DMRS pattern, wherein the intra-slot DMRS patternindicates one or more time domain multiplexed symbols, each symbol ofthe one or more time domain multiplexed symbols being at least partiallyallocated with at least one DMRS scrambling sequence of the one or moreDMRS scrambling sequences (block 520). For example, the UE (e.g., usingcommunication manager 140 and/or reception component 702, depicted inFIG. 7 ) may receive the downlink MIMO communication including a DMRSaccording to an intra-slot DMRS pattern, wherein the intra-slot DMRSpattern indicates one or more time domain multiplexed symbols, eachsymbol of the one or more time domain multiplexed symbols being at leastpartially allocated with at least one DMRS scrambling sequence of theone or more DMRS scrambling sequences, as described above.

Process 500 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the intra-slot DMRS pattern indicates that a symbolof the one or more time domain multiplexed symbols is partiallyallocated with a single DMRS scrambling sequence of the one or more DMRSscrambling sequences.

In a second aspect, alone or in combination with the first aspect, theintra-slot DMRS pattern indicates that a symbol of the one or more timedomain multiplexed symbols is fully allocated with a single DMRSscrambling sequence of the one or more DMRS scrambling sequences.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the intra-slot DMRS pattern indicates that a symbolof the one or more time domain multiplexed symbols is at least partiallyallocated with a first DMRS scrambling sequence of the one or more DMRSscrambling sequences and is at least partially allocated with a secondDMRS scrambling sequence of the one or more DMRS scrambling sequences.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the low PAPR sequence generator is aZadoff-Chu sequence generator.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the downlink MIMO communication is received on afrequency that is greater than approximately 52 GHz.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, process 500 includes receiving a configurationthat indicates the intra-slot DMRS pattern.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the configuration is received via at leastone of DCI, a MAC-CE, or RRC signaling.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the DMRS is received according to aninter-slot DMRS pattern that indicates one or more slots, of a pluralityof slots of the downlink MIMO communication, in which the DMRS is to bereceived.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, process 500 includes receiving a configurationthat indicates the inter-slot DMRS pattern.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the configuration is received via at least one ofDCI, a MAC-CE, or RRC signaling.

Although FIG. 5 shows example blocks of process 500, in some aspects,process 500 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 5 .Additionally, or alternatively, two or more of the blocks of process 500may be performed in parallel.

FIG. 6 is a diagram illustrating an example process 600 performed, forexample, by a network node, in accordance with the present disclosure.Example process 600 is an example where the network node (e.g., networknode 110) performs operations associated with a low PAPR DMRS sequenceand pattern.

As shown in FIG. 6 , in some aspects, process 600 may includedetermining one or more DMRS scrambling sequences using a low PAPRsequence generator, wherein each DMRS scrambling sequence of the one ormore DMRS scrambling sequences corresponds to a respective port of oneor more ports, the one or more ports being associated with a downlinkMIMO communication, wherein the downlink MIMO communication is aDFT-s-OFDM-based communication (block 610). For example, the networknode (e.g., using communication manager 150 and/or low PAPR scramblingsequence generator 808, depicted in FIG. 8 ) may determine one or moreDMRS scrambling sequences using a low PAPR sequence generator, whereineach DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication,wherein the downlink MIMO communication is a DFT-s-OFDM-basedcommunication, as described above.

As further shown in FIG. 6 , in some aspects, process 600 may includetransmitting the downlink MIMO communication including a DMRS accordingto an intra-slot DMRS pattern, wherein the intra-slot DMRS patternindicates one or more time domain multiplexed symbols, each symbol ofthe one or more time domain multiplexed symbols being at least partiallyallocated with at least one DMRS scrambling sequence of the one or moreDMRS scrambling sequences (block 620). For example, the network node(e.g., using communication manager 150 and/or transmission component804, depicted in FIG. 8 ) may transmit the downlink MIMO communicationincluding a DMRS according to an intra-slot DMRS pattern, wherein theintra-slot DMRS pattern indicates one or more time domain multiplexedsymbols, each symbol of the one or more time domain multiplexed symbolsbeing at least partially allocated with at least one DMRS scramblingsequence of the one or more DMRS scrambling sequences, as describedabove.

Process 600 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the intra-slot DMRS pattern indicates that a symbolof the one or more time domain multiplexed symbols is at least partiallyallocated with a single DMRS scrambling sequence of the one or more DMRSscrambling sequences.

In a second aspect, alone or in combination with the first aspect, theintra-slot DMRS pattern indicates that a symbol of the one or more timedomain multiplexed symbols is fully allocated with a single DMRSscrambling sequence of the one or more DMRS scrambling sequences.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the intra-slot DMRS pattern indicates that a symbolof the one or more time domain multiplexed symbols is at least partiallyallocated with a first DMRS scrambling sequence of the one or more DMRSscrambling sequences and is at least partially allocated with a secondDMRS scrambling sequence of the one or more DMRS scrambling sequences.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the low PAPR sequence generator is aZadoff-Chu sequence generator.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the downlink MIMO communication is transmittedon a frequency that is greater than approximately 52 GHz.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, process 600 includes transmitting a configurationthat indicates the intra-slot DMRS pattern.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the configuration is transmitted via atleast one of DCI, a MAC-CE, or RRC signaling.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, process 600 includes transmitting theconfiguration based at least in part on a determination that acharacteristic of a channel associated with the downlink MIMOcommunication satisfies a threshold.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the DMRS is transmitted according to aninter-slot DMRS pattern that indicates one or more slots, of a pluralityof slots of the downlink MIMO communication, in which the DMRS is to betransmitted.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, process 600 includes transmitting a configurationthat indicates the inter-slot DMRS pattern.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the configuration is transmitted via atleast one of DCI, a MAC-CE, or RRC signaling.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, process 600 includes transmitting theconfiguration based at least in part on a determination that acharacteristic of a channel associated with the downlink MIMOcommunication satisfies a threshold.

Although FIG. 6 shows example blocks of process 600, in some aspects,process 600 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 6 .Additionally, or alternatively, two or more of the blocks of process 600may be performed in parallel.

FIG. 7 is a diagram of an example apparatus 700 for wirelesscommunication, in accordance with the present disclosure. The apparatus700 may be a UE, or a UE may include the apparatus 700. In some aspects,the apparatus 700 includes a reception component 702 and a transmissioncomponent 704, which may be in communication with one another (forexample, via one or more buses and/or one or more other components). Asshown, the apparatus 700 may communicate with another apparatus 706(such as a UE, a base station, or another wireless communication device)using the reception component 702 and the transmission component 704. Asfurther shown, the apparatus 700 may include the communication manager140. The communication manager 140 may include a low PAPR scramblingsequence generator 708, among other examples.

In some aspects, the apparatus 700 may be configured to perform one ormore operations described herein in connection with FIGS. 4A and 4B.Additionally, or alternatively, the apparatus 700 may be configured toperform one or more processes described herein, such as process 500 ofFIG. 5 . In some aspects, the apparatus 700 and/or one or morecomponents shown in FIG. 7 may include one or more components of the UEdescribed in connection with FIG. 2 . Additionally, or alternatively,one or more components shown in FIG. 7 may be implemented within one ormore components described in connection with FIG. 2 . Additionally, oralternatively, one or more components of the set of components may beimplemented at least in part as software stored in a memory. Forexample, a component (or a portion of a component) may be implemented asinstructions or code stored in a non-transitory computer-readable mediumand executable by a controller or a processor to perform the functionsor operations of the component.

The reception component 702 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 706. The reception component 702may provide received communications to one or more other components ofthe apparatus 700. In some aspects, the reception component 702 mayperform signal processing on the received communications (such asfiltering, amplification, demodulation, analog-to-digital conversion,demultiplexing, deinterleaving, de-mapping, equalization, interferencecancellation, or decoding, among other examples), and may provide theprocessed signals to the one or more other components of the apparatus700. In some aspects, the reception component 702 may include one ormore antennas, a modem, a demodulator, a MIMO detector, a receiveprocessor, a controller/processor, a memory, or a combination thereof,of the UE described in connection with FIG. 2 .

The transmission component 704 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 706. In some aspects, one or moreother components of the apparatus 700 may generate communications andmay provide the generated communications to the transmission component704 for transmission to the apparatus 706. In some aspects, thetransmission component 704 may perform signal processing on thegenerated communications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 706. In some aspects, the transmission component 704may include one or more antennas, a modem, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the UE described in connection with FIG. 2 . Insome aspects, the transmission component 704 may be co-located with thereception component 702 in a transceiver.

The low PAPR scrambling sequence generator 708 may determine one or moreDMRS scrambling sequences using a low PAPR sequence generator, whereineach DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication,wherein the downlink MIMO communication is a DFT-s-OFDM)-basedcommunication. The reception component 702 may receive the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS pattern,wherein the intra-slot DMRS pattern indicates one or more time domainmultiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.

The reception component 702 may receive a configuration that indicatesthe intra-slot DMRS pattern.

The reception component 702 may receive a configuration that indicatesthe inter-slot DMRS pattern.

The number and arrangement of components shown in FIG. 7 are provided asan example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 7 . Furthermore, two or more components shownin FIG. 7 may be implemented within a single component, or a singlecomponent shown in FIG. 7 may be implemented as multiple, distributedcomponents. Additionally, or alternatively, a set of (one or more)components shown in FIG. 7 may perform one or more functions describedas being performed by another set of components shown in FIG. 7 .

FIG. 8 is a diagram of an example apparatus 800 for wirelesscommunication, in accordance with the present disclosure. The apparatus800 may be a network node, or a network node may include the apparatus800. In some aspects, the apparatus 800 includes a reception component802 and a transmission component 804, which may be in communication withone another (for example, via one or more buses and/or one or more othercomponents). As shown, the apparatus 800 may communicate with anotherapparatus 806 (such as a UE, a base station, or another wirelesscommunication device) using the reception component 802 and thetransmission component 804. As further shown, the apparatus 800 mayinclude the communication manager 150. The communication manager 150 mayinclude a low PAPR scrambling sequence generator 808, among otherexamples.

In some aspects, the apparatus 800 may be configured to perform one ormore operations described herein in connection with FIGS. 4A and 4B.Additionally, or alternatively, the apparatus 800 may be configured toperform one or more processes described herein, such as process 600 ofFIG. 6 . In some aspects, the apparatus 800 and/or one or morecomponents shown in FIG. 8 may include one or more components of thenetwork node described in connection with FIG. 2 . Additionally, oralternatively, one or more components shown in FIG. 8 may be implementedwithin one or more components described in connection with FIG. 2 .Additionally, or alternatively, one or more components of the set ofcomponents may be implemented at least in part as software stored in amemory. For example, a component (or a portion of a component) may beimplemented as instructions or code stored in a non-transitorycomputer-readable medium and executable by a controller or a processorto perform the functions or operations of the component.

The reception component 802 may receive communications, such asreference signals, control information, data communications, or acombination thereof, from the apparatus 806. The reception component 802may provide received communications to one or more other components ofthe apparatus 800. In some aspects, the reception component 802 mayperform signal processing on the received communications (such asfiltering, amplification, demodulation, analog-to-digital conversion,demultiplexing, deinterleaving, de-mapping, equalization, interferencecancellation, or decoding, among other examples), and may provide theprocessed signals to the one or more other components of the apparatus800. In some aspects, the reception component 802 may include one ormore antennas, a modem, a demodulator, a MIMO detector, a receiveprocessor, a controller/processor, a memory, or a combination thereof,of the network node described in connection with FIG. 2 .

The transmission component 804 may transmit communications, such asreference signals, control information, data communications, or acombination thereof, to the apparatus 806. In some aspects, one or moreother components of the apparatus 800 may generate communications andmay provide the generated communications to the transmission component804 for transmission to the apparatus 806. In some aspects, thetransmission component 804 may perform signal processing on thegenerated communications (such as filtering, amplification, modulation,digital-to-analog conversion, multiplexing, interleaving, mapping, orencoding, among other examples), and may transmit the processed signalsto the apparatus 806. In some aspects, the transmission component 804may include one or more antennas, a modem, a modulator, a transmit MIMOprocessor, a transmit processor, a controller/processor, a memory, or acombination thereof, of the network node described in connection withFIG. 2 . In some aspects, the transmission component 804 may beco-located with the reception component 802 in a transceiver.

The low PAPR scrambling sequence generator 808 may determine one or moreDMRS scrambling sequences using a low PAPR sequence generator, whereineach DMRS scrambling sequence of the one or more DMRS scramblingsequences corresponds to a respective port of one or more ports, the oneor more ports being associated with a downlink MIMO communication,wherein the downlink MIMO communication is a DFT-s-OFDM-basedcommunication. The transmission component 804 may transmit the downlinkMIMO communication including a DMRS according to an intra-slot DMRSpattern, wherein the intra-slot DMRS pattern indicates one or more timedomain multiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.

The transmission component 804 may transmit a configuration thatindicates the intra-slot DMRS pattern.

The transmission component 804 may transmit the configuration based atleast in part on a determination that a characteristic of a channelassociated with the downlink MIMO communication satisfies a threshold.

The transmission component 804 may transmit a configuration thatindicates the inter-slot DMRS pattern.

The transmission component 804 may transmit the configuration based atleast in part on a determination that a characteristic of a channelassociated with the downlink MIMO communication satisfies a threshold.

The number and arrangement of components shown in FIG. 8 are provided asan example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 8 . Furthermore, two or more components shownin FIG. 8 may be implemented within a single component, or a singlecomponent shown in FIG. 8 may be implemented as multiple, distributedcomponents. Additionally, or alternatively, a set of (one or more)components shown in FIG. 8 may perform one or more functions describedas being performed by another set of components shown in FIG. 8 .

The following provides an overview of some Aspects of the presentdisclosure:

Aspect 1: A method of wireless communication performed by a UE,comprising: determining one or more DMRS scrambling sequences using alow PAPR sequence generator, wherein each DMRS scrambling sequence ofthe one or more DMRS scrambling sequences corresponds to a respectiveport of one or more ports, the one or more ports being associated with adownlink MIMO communication, wherein the downlink MIMO communication isa DFT-s-OFDM-based communication; and receiving the downlink MIMOcommunication including a DMRS according to an intra-slot DMRS pattern,wherein the intra-slot DMRS pattern indicates one or more time domainmultiplexed symbols, each symbol of the one or more time domainmultiplexed symbols being at least partially allocated with at least oneDMRS scrambling sequence of the one or more DMRS scrambling sequences.

Aspect 2: The method of Aspect 1, wherein the intra-slot DMRS patternindicates that a symbol of the one or more time domain multiplexedsymbols is partially allocated with a single DMRS scrambling sequence ofthe one or more DMRS scrambling sequences.

Aspect 3: The method of any of Aspects 1-2, wherein the intra-slot DMRSpattern indicates that a symbol of the one or more time domainmultiplexed symbols is fully allocated with a single DMRS scramblingsequence of the one or more DMRS scrambling sequences.

Aspect 4: The method of any of Aspects 1-3, wherein the intra-slot DMRSpattern indicates that a symbol of the one or more time domainmultiplexed symbols is at least partially allocated with a first DMRSscrambling sequence of the one or more DMRS scrambling sequences and isat least partially allocated with a second DMRS scrambling sequence ofthe one or more DMRS scrambling sequences.

Aspect 5: The method of any of Aspects 1-4, wherein the low PAPRsequence generator is a Zadoff-Chu sequence generator.

Aspect 6: The method of any of Aspects 1-5, wherein the downlink MIMOcommunication is received on a frequency that is greater thanapproximately 52 GHz.

Aspect 7: The method of any of Aspects 1-6, further comprising receivinga configuration that indicates the intra-slot DMRS pattern.

Aspect 8: The method of Aspect 7, wherein the configuration is receivedvia at least one of DCI, a MAC-CE, or RRC signaling.

Aspect 9: The method of any of Aspects 1-8, wherein the DMRS is receivedaccording to an inter-slot DMRS pattern that indicates one or moreslots, of a plurality of slots of the downlink MIMO communication, inwhich the DMRS is to be received.

Aspect 10: The method of Aspect 9, further comprising receiving aconfiguration that indicates the inter-slot DMRS pattern.

Aspect 11: The method of Aspect 10, wherein the configuration isreceived via at least one of DCI, a MAC-CE, or RRC signaling.

Aspect 12: A method of wireless communication performed by a networknode, comprising: determining one or more DMRS scrambling sequencesusing a low PAPR sequence generator, wherein each DMRS scramblingsequence of the one or more DMRS scrambling sequences corresponds to arespective port of one or more ports, the one or more ports beingassociated with a downlink MIMO communication, wherein the downlink MIMOcommunication is a DFT-s-OFDM-based communication; and transmitting thedownlink MIMO communication including a DMRS according to an intra-slotDMRS pattern, wherein the intra-slot DMRS pattern indicates one or moretime domain multiplexed symbols, each symbol of the one or more timedomain multiplexed symbols being at least partially allocated with atleast one DMRS scrambling sequence of the one or more DMRS scramblingsequences.

Aspect 13: The method of Aspect 12, wherein the intra-slot DMRS patternindicates that a symbol of the one or more time domain multiplexedsymbols is at least partially allocated with a single DMRS scramblingsequence of the one or more DMRS scrambling sequences.

Aspect 14: The method of any of Aspects 12-13, wherein the intra-slotDMRS pattern indicates that a symbol of the one or more time domainmultiplexed symbols is fully allocated with a single DMRS scramblingsequence of the one or more DMRS scrambling sequences.

Aspect 15: The method of any of Aspects 12-14, wherein the intra-slotDMRS pattern indicates that a symbol of the one or more time domainmultiplexed symbols is at least partially allocated with a first DMRSscrambling sequence of the one or more DMRS scrambling sequences and isat least partially allocated with a second DMRS scrambling sequence ofthe one or more DMRS scrambling sequences.

Aspect 16: The method of any of Aspects 12-15, wherein the low PAPRsequence generator is a Zadoff-Chu sequence generator.

Aspect 17: The method of any of Aspects 12-16, wherein the downlink MIMOcommunication is transmitted on a frequency that is greater thanapproximately 52 GHz.

Aspect 18: The method of any of Aspects 12-17, further comprisingtransmitting a configuration that indicates the intra-slot DMRS pattern.

Aspect 19: The method of Aspect 18, wherein the configuration istransmitted via at least one of DCI, a MAC-CE, or RRC signaling.

Aspect 20: The method of any of Aspects 18-19, further comprisingtransmitting the configuration based at least in part on a determinationthat a characteristic of a channel associated with the downlink MIMOcommunication satisfies a threshold.

Aspect 21: The method of any of Aspects 12-20, wherein the DMRS istransmitted according to an inter-slot DMRS pattern that indicates oneor more slots, of a plurality of slots of the downlink MIMOcommunication, in which the DMRS is to be transmitted.

Aspect 22: The method of Aspect 21, further comprising transmitting aconfiguration that indicates the inter-slot DMRS pattern.

Aspect 23: The method of Aspect 22, wherein the configuration istransmitted via at least one of DCI, a MAC-CE, or RRC signaling.

Aspect 24: The method of any of Aspects 22-23, further comprisingtransmitting the configuration based at least in part on a determinationthat a characteristic of a channel associated with the downlink MIMOcommunication satisfies a threshold.

Aspect 25: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more of Aspects1-11.

Aspect 26: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the one or more processorsconfigured to perform the method of one or more of Aspects 1-11.

Aspect 27: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more of Aspects 1-11.

Aspect 28: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more of Aspects 1-11.

Aspect 29: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore of Aspects 1-11.

Aspect 30: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more of Aspects12-24.

Aspect 31: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the one or more processorsconfigured to perform the method of one or more of Aspects 12-24.

Aspect 32: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more of Aspects 12-24.

Aspect 33: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more of Aspects 12-24.

Aspect 34: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore of Aspects 12-24.

The foregoing disclosure provides illustration and description but isnot intended to be exhaustive or to limit the aspects to the preciseforms disclosed. Modifications and variations may be made in light ofthe above disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware and/or a combination of hardware and software. “Software”shall be construed broadly to mean instructions, instruction sets, code,code segments, program code, programs, subprograms, software modules,applications, software applications, software packages, routines,subroutines, objects, executables, threads of execution, procedures,and/or functions, among other examples, whether referred to as software,firmware, middleware, microcode, hardware description language, orotherwise. As used herein, a “processor” is implemented in hardwareand/or a combination of hardware and software. It will be apparent thatsystems and/or methods described herein may be implemented in differentforms of hardware and/or a combination of hardware and software. Theactual specialized control hardware or software code used to implementthese systems and/or methods is not limiting of the aspects. Thus, theoperation and behavior of the systems and/or methods are describedherein without reference to specific software code, since those skilledin the art will understand that software and hardware can be designed toimplement the systems and/or methods based, at least in part, on thedescription herein.

As used herein, “satisfying a threshold” may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, or thelike.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. Many of thesefeatures may be combined in ways not specifically recited in the claimsand/or disclosed in the specification. The disclosure of various aspectsincludes each dependent claim in combination with every other claim inthe claim set. As used herein, a phrase referring to “at least one of” alist of items refers to any combination of those items, including singlemembers. As an example, “at least one of: a, b, or c” is intended tocover a, b, c, a+b, a+c, b+c, and a+b+c, as well as any combination withmultiples of the same element (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b,a+c+c, b+b, b+b+b, b+b+c, c+c, and c+c+c, or any other ordering of a, b,and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems and may be used interchangeably with “one or more.” Further, asused herein, the article “the” is intended to include one or more itemsreferenced in connection with the article “the” and may be usedinterchangeably with “the one or more.” Furthermore, as used herein, theterms “set” and “group” are intended to include one or more items andmay be used interchangeably with “one or more.” Where only one item isintended, the phrase “only one” or similar language is used. Also, asused herein, the terms “has,” “have,” “having,” or the like are intendedto be open-ended terms that do not limit an element that they modify(e.g., an element “having” A may also have B). Further, the phrase“based on” is intended to mean “based, at least in part, on” unlessexplicitly stated otherwise. Also, as used herein, the term “or” isintended to be inclusive when used in a series and may be usedinterchangeably with “and/or,” unless explicitly stated otherwise (e.g.,if used in combination with “either” or “only one of”).

What is claimed is:
 1. A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors, coupled to the memory, configured to: determine one or more demodulation reference signal (DMRS) scrambling sequences using a low peak-to-average power ratio (PAPR) sequence generator, wherein each DMRS scrambling sequence of the one or more DMRS scrambling sequences corresponds to a respective port of one or more ports, the one or more ports being associated with a downlink multiple input multiple output (MIMO) communication, wherein the downlink MIMO communication is a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)-based communication; and receive the downlink MIMO communication including a DMRS according to an intra-slot DMRS pattern, wherein the intra-slot DMRS pattern indicates one or more time domain multiplexed symbols, each symbol of the one or more time domain multiplexed symbols being at least partially allocated with at least one DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 2. The UE of claim 1, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is partially allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 3. The UE of claim 1, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is fully allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 4. The UE of claim 1, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is at least partially allocated with a first DMRS scrambling sequence of the one or more DMRS scrambling sequences and is at least partially allocated with a second DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 5. The UE of claim 1, wherein the low PAPR sequence generator is a Zadoff-Chu sequence generator.
 6. The UE of claim 1, wherein the downlink MIMO communication is received on a frequency that is greater than approximately 52 gigahertz (GHz).
 7. The UE of claim 1, wherein the one or more processors are further configured to receive a configuration that indicates the intra-slot DMRS pattern.
 8. The UE of claim 7, wherein the configuration is received via at least one of downlink control information (DCI), a medium access control (MAC) control element (CE), or radio resource control (RRC) signaling.
 9. The UE of claim 1, wherein the DMRS is received according to an inter-slot DMRS pattern that indicates one or more slots, of a plurality of slots of the downlink MIMO communication, in which the DMRS is to be received.
 10. The UE of claim 9, wherein the one or more processors are further configured to receive a configuration that indicates the inter-slot DMRS pattern.
 11. The UE of claim 10, wherein the configuration is received via at least one of downlink control information (DCI), a medium access control (MAC) control element (CE), or radio resource control (RRC) signaling.
 12. A network node for wireless communication, comprising: a memory; and one or more processors, coupled to the memory, configured to: determine one or more demodulation reference signal (DMRS) scrambling sequences using a low peak-to-average power ratio (PAPR) sequence generator, wherein each DMRS scrambling sequence of the one or more DMRS scrambling sequences corresponds to a respective port of one or more ports, the one or more ports being associated with a downlink multiple input multiple output (MIMO) communication, wherein the downlink MIMO communication is a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)-based communication; and transmit the downlink MIMO communication including a DMRS according to an intra-slot DMRS pattern, wherein the intra-slot DMRS pattern indicates one or more time domain multiplexed symbols, each symbol of the one or more time domain multiplexed symbols being at least partially allocated with at least one DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 13. The network node of claim 12, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is at least partially allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 14. The network node of claim 12, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is fully allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 15. The network node of claim 12, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is at least partially allocated with a first DMRS scrambling sequence of the one or more DMRS scrambling sequences and is at least partially allocated with a second DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 16. The network node of claim 12, wherein the low PAPR sequence generator is a Zadoff-Chu sequence generator.
 17. The network node of claim 12, wherein the downlink MIMO communication is transmitted on a frequency that is greater than approximately 52 gigahertz (GHz).
 18. The network node of claim 12, wherein the one or more processors are further configured to transmit a configuration that indicates the intra-slot DMRS pattern.
 19. The network node of claim 18, wherein the configuration is transmitted via at least one of downlink control information (DCI), a medium access control (MAC) control element (CE), or radio resource control (RRC) signaling.
 20. The network node of claim 18, wherein the one or more processors are further configured to transmit the configuration based at least in part on a determination that a characteristic of a channel associated with the downlink MIMO communication satisfies a threshold.
 21. The network node of claim 12, wherein the DMRS is transmitted according to an inter-slot DMRS pattern that indicates one or more slots, of a plurality of slots of the downlink MIMO communication, in which the DMRS is to be transmitted.
 22. The network node of claim 21, wherein the one or more processors are further configured to transmit a configuration that indicates the inter-slot DMRS pattern.
 23. The network node of claim 22, wherein the configuration is transmitted via at least one of downlink control information (DCI), a medium access control (MAC) control element (CE), or radio resource control (RRC) signaling.
 24. The network node of claim 22, wherein the one or more processors are further configured to transmit the configuration based at least in part on a determination that a characteristic of a channel associated with the downlink MIMO communication satisfies a threshold.
 25. A method of wireless communication performed by a user equipment (UE), comprising: determining one or more demodulation reference signal (DMRS) scrambling sequences using a low peak-to-average power ratio (PAPR) sequence generator, wherein each DMRS scrambling sequence of the one or more DMRS scrambling sequences corresponds to a respective port of one or more ports, the one or more ports being associated with a downlink multiple input multiple output (MIMO) communication, wherein the downlink MIMO communication is a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)-based communication; and receiving the downlink MIMO communication including a DMRS according to an intra-slot DMRS pattern, wherein the intra-slot DMRS pattern indicates one or more time domain multiplexed symbols, each symbol of the one or more time domain multiplexed symbols being at least partially allocated with at least one DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 26. The method of claim 25, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is partially allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 27. The method of claim 25, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is fully allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 28. A method of wireless communication performed by a network node, comprising: determining one or more demodulation reference signal (DMRS) scrambling sequences using a low peak-to-average power ratio (PAPR) sequence generator, wherein each DMRS scrambling sequence of the one or more DMRS scrambling sequences corresponds to a respective port of one or more ports, the one or more ports being associated with a downlink multiple input multiple output (MIMO) communication, wherein the downlink MIMO communication is a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)-based communication; and transmitting the downlink MIMO communication including a DMRS according to an intra-slot DMRS pattern, wherein the intra-slot DMRS pattern indicates one or more time domain multiplexed symbols, each symbol of the one or more time domain multiplexed symbols being at least partially allocated with at least one DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 29. The method of claim 28, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is at least partially allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences.
 30. The method of claim 28, wherein the intra-slot DMRS pattern indicates that a symbol of the one or more time domain multiplexed symbols is fully allocated with a single DMRS scrambling sequence of the one or more DMRS scrambling sequences. 